Magnetic Fluctuations Near a Helical Reorientation Transition.

ORAL

Abstract

Magnetic spin textures are a non-trivial distribution of magnetization vectors in a sample which are promising for future low power computing in part due to their topological protection. A popular material that hosts these spin textures is FeGe which shows a wide range of various spin textures at relatively high temperatures. In this talk, I will focus on the amorphous counterpart of this material and investigate the phase transition pathway between a disordered helical phase and a paramagnetic phase. As a result of the unique energy landscape provided by the amorphous nature of our sample, we find that the helical propagation direction reorients from being purely in-plane to canted out-of-plane and is mediated by the production of topological defects. By using coherent soft X-ray scattering, we were able to investigate the magnetic fluctuations as this helix reorients.

*U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05-CH11231 (NEMM program MSMAG)

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Publication: Static and Dynamic Correlations of Magnetic Helices in Amorphous FeGe. (In preparation).

Presenters

  • Ryan Tumbleson

    • University of California, Santa Cruz

Authors

  • Ryan Tumbleson

    • University of California, Santa Cruz

  • Emily M Hollingworth

    • University of California, Berkeley

  • ARNAB SINGH

    • Lawrence Berkeley National Laboratory

  • Nicolas G Burdet

    • SLAC National Accelerator Laboratory

  • Sophie A Morley

    • Lawrence Berkeley National Lab

  • Ahmad Ikhwan Us Saleheen

    • Lawrence Berkeley National Laboratory

  • Margaret R McCarter

    • Lawrence Berkeley National Laboratory

  • David Raftrey

    • University of California, Santa Cruz

  • Vincent Esposito

    • SLAC national Accelerator Laboratory

  • Georgi Dakovski

    • SLAC National Accelerator Laboratory

  • Franz J Decker

    • Stanford Univ

  • Alexander H Reid

    • SLAC National Accelerator Laboratory

  • Tadesse Assefa

    • SLAC National Accelerator Laboratory

  • Peter J Fischer

    • Lawrence Berkeley National Laboratory

  • Stephen D Kevan

    • Lawrence Berkeley National Laboratory

  • Frances Hellman

    • University of California, Berkeley

  • Joshua J Turner

    • SLAC - National Accelerator Laboratory

  • Sujoy Roy

    • Lawrence Berkeley National Lab